/**

* Copyright 2013-2014, Facebook, Inc.

* All rights reserved.

*

* This source code is licensed under the BSD-style license found in the

* LICENSE file in the root directory of this source tree. An additional grant

* of patent rights can be found in the PATENTS file in the same directory.

*

* @providesModule shallowEqual

*/

"use strict";

/**

* Performs equality by iterating through keys on an object and returning

* false when any key has values which are not strictly equal between

* objA and objB. Returns true when the values of all keys are strictly equal.

*

* @return {boolean}

*/

function shallowEqual(objA, objB) {

if (objA === objB) {

return true;

}

var key;

// Test for A's keys different from B.

for (key in objA) {

if (objA.hasOwnProperty(key) &&

(!objB.hasOwnProperty(key) || objA[key] !== objB[key])) {

return false;

}

}

// Test for B's keys missing from A.

for (key in objB) {

if (objB.hasOwnProperty(key) && !objA.hasOwnProperty(key)) {

return false;

}

}

return true;

}

module.exports = shallowEqual;